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Which of the following is not true for a species?

1. Members of a species can interbreed.
2. Gene flow does not occur between the populations of a species.
3. Each species is reproductively isolated from every other species.
4. Variations occur among members of a species.

Correct answer: Gene flow does not occur between the populations of a species.

Solution

The statement is not true because populations within the same species can exchange genes through interbreeding, so gene flow can occur among them. The other statements match the biological species concept: members can interbreed, species are reproductively isolated from other species, and variation exists within a species.

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